LTC1255
Dual 24V High-Side
MOSFET Driver
FEATURES
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DESCRIPTIO
Fully Enhances N-Channel Power MOSFETs
12µA Standby Current
Operates at Supply Voltages from 9V to 24V
Short Circuit Protection
Easily Protected Against Supply Transients
Controlled Switching ON and OFF Times
No External Charge Pump Components
Compatible With Standard Logic Families
Available in 8-Pin SOIC
The LTC1255 dual high-side driver allows using low
cost N-channel FETs for high-side industrial and auto-
motive switching applications. An internal charge pump
boosts the gate drive voltage above the positive rail,
fully enhancing an N-channel MOS switch with no
external components. Low power operation, with 12µA
standby current, allows use in virtually all systems with
maximum efficiency.
Included on-chip is independent overcurrent sensing
to provide automatic shutdown in case of short circuits.
A time delay can be added to the current sense to
prevent false triggering on high in-rush current loads.
The LTC1255 operates from 9V to 24V supplies and is
well suited for industrial and automotive applications.
The LTC1255 is available in both an 8-pin DIP and an
8-pin SOIC.
APPLICATI
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Solenoid Drivers
DC Motor Drivers
Stepper Motor Drivers
Lamp Drivers/Dimmers
Relay Drivers
Low Frequency H-Bridge
P-Channel Switch Replacement
TYPICAL APPLICATI
Dual 24V High-Side Switch with Overcurrent Protection
24V
+
0.036Ω
10µF
V
S
DS1
IRLR024
12V
DS2
IRLR024
12V
G1 LTC1255 G2
IN1
GND
IN2
0.036Ω
SUPPLY CURRENT (µA)
24V/0.5A
SOLENOID
FROM
1N4001
µP,
ETC.
FROM
µP,
ETC.
1N4001
24V/0.5A
SOLENOID
LTC1255 • TA01
U
Standby Supply Current
50
45
40
35
30
25
20
15
10
5
0
0
5
15
20
10
SUPPLY VOLTAGE (V)
25
30
V
IN1
= V
IN2
= 0V
T
A
= 25°C
LTC1255 • TA02
UO
UO
1
LINER [ LINEAR TECHNOLOGY ]
